Saw grinding device



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5 Sheeigs-Sheet 1 July 3, 1945.v

P. Ku-:cHLE

SAW GRINDING DEVICE Filed oct. 14, 1945 Jul? 3, v1945- P. KlEcHLE SAW GRINDING DEVICE 5 Sheets-#Sheet 2 Filed oct. 14, 194s 'PAUL /r/ECHLE INVENroR. L 6%@ 9^ 1 'lll l'y .HTTRIYE'Y P. KIi-:CHLE

SAW GRINDING DEVlCE med osg. 14, 194s vJuly 3, 1945.

5 Sheets-Sheet 5 IN VEN TOR. PAUL K/ECHLE July 3, 1945.'

P. Knien-n.15: -sAw GRINDING DEVICE Filled 061'.. v14n 1943 5 Sheets-Sheet 4 FAL/L Hic/#Lf IN VEN TOR.

zii/vm July 3, 1945. P. KlEcHLE 2,379,542

SAW GRINDING DEVICE I Filed ocr. 14, 194s 5 sheds-snaai 5 U, hw.

W'llffm" JNM.

Patented July 3, 1945 1 UNITED- STATES PATENT 4OFFICE SAW GRnvnING'EvrcE f i Paul Kiechle, New York, N. Y. Application october 14, 1943,'se1-ia1N0. 506,208

n 40mm/s. (C1. 'ze- 41) This invention relates to devices for grinding and sharpening saws. or the like and more particularly to machinesfor forming the teeth of endless or -continuous band saws such as are used in the steel and wood industry.

In the applicants invention an annular rotary grinding disk, of carborundum or such like ma terial, is used to grind the teeth of theband saw to the desired shape and depth, the latter being attached to a fast electric motor that is fastened upon a platform which is made to move vertically and horizontally through themedium of a set of rotating cams and pivotably mounted levers. In addition the invention providesfmeans for tilting the electric motor and rotarycutter means respectively upon a vertical plane relative to the position of the band saw, to take care of' th vertical inclination of the teeth of the blade.

A further object of this invention is to provide a bandsaw grinding machine which will utilize a very thin circular rotating grinding stone,.the lat.. ter being driven at high speed by means of an electric motor. Another object of this invention is to provide horizontal feeding means to facilitate'the moving of the grinding stone along the inclined portion of the teeth' of the band saw. A still another object of this invention is to provide vertical aci-,

justing means to facilitate the sliding (raising or lowering) ofthe grinding stone along the top and bottom or cutting edge of the teethk of the band saw. d

'An additional object of this invention lis to pro-- vide means for feeding the band saw at least one tooth at a time in Astep-like movement, and clamping means for holding the blade in position during the tooth grinding operation.

A further object of this invention is to provide cam means to facilitate the activation ofthe rotating'grinding wheel along the inclined portion of the tooth and reciprocating means for advancing the band saw at least one tooth at a time.

' 'A still further object of this invention is to pro'-v vide setting at a tangentmeans to' facilitate the tilting of the circular grinding stone upon ,diverse diagonal planes relative to the position ofthe band saw and means for adjusting the tilting angle of the filing wheel. f

A still additional object ofthis invention is to provide means for adjusting the vertical positionv ofthe band'saw to rtake care ofthe difference in Width and the make.

With the foregoing objects outlined'Y and with other objects in view which will appear as ,the

description proceeds, the invention consists in the novel features hereinafter described in detail, illustrated in the -accompanying drawings, and more' particularly pointed out in the appended claims.

depth of band sawsof standard.

Referring to the drawings, Fig. l is a front elevation of the band saw grinding machineshowing the ycircular filing disk andthe mechanism for advancing thevblade one tooth at a time.

rpositionof the circular grinding disk before descendingalong the vertical portion. or cutting edge of the tooth of the band Saw,

Fig'` ll isA afront elevation showing the position of the grinding diskA after ascending along the inclined portion o f the tooth of the endless saw. d Fig. 5 is a horizontal cross-section taken on a line 5-5 offFig. 1 showingv the cam arrangement and the feeding means for advancing the band saw blade one'tooth at a-time. Fig.A 6 is a side view taken alongthe line 6-6 n of Fig. 1 showing the platform on which the attached toand the clamping arrangement for clamping the band saw in position during the toothl grinding operation. Fig.' `'7 is a section taken on the line 'I-l o:f..lig.y 1 showing the sliding dev etaiij arrangement to facilitate the advancing of .the band saw one tooth atatime.` l v d Fig. 8 is a section. taken on a line 8-.-8 of Fig. 1 showing further details ofthe sliding arrange-y electric motor andr grinding disk respectively `are f ment for advancing the band saw one tooth at a time. f

Fig. 9is illustrativeof a modification of the cross section of the rotating grinding disk used in Figs. 1 to inclusive. In the present case the outside circumference of the ygrinding stone is the grinding of new teeth having a circular ibase.,

Fig. 10v illustrates'-another modication of the grinding disk and saw blade shown in Fig. 1. In this particular casethegrinding disk is operated insuch a manner as to implant a circular ybase to the teeth of the saw and to grind a trapezeshaped cutting edge thereto.

Referring to Fig. 1, 2 0 represents the band saw grinding machine described in this application wherein' 2| is the electric motor used for rotating the thin grindingdisk 22, the latter being attached to the' driving shaft 23 of the electricmotor 2I`Iby means of a nut 24 which is threaded upon the threaded extension 25 of the shaft .23; In addition' the driving shaft 23has a circular stop 26 andl apair'of `disks 21 and 28 which are placed on either side of the circular disk 22 before tightening the nut 24 upon the threaded extension 25.

The motor 2| is attached upon a base 29 which is made to tilt upon a vertical plane through the medium of a swivel point 30. The swivel 30 consists of a bolt 30a that is securely held within the sliding dovetailed member 3|, and an extension 30hwhich is fitted within a reamed'hole 3|c in the base 29. The dovetailed member 3| is made to slide within a dovetailed plate 32 which is attached toa secondary vertically sliding dovetailed member 33 that is slidably held within the' dovetailed portion 34 of the upright supporting casting 35. The dovetailed member 33 has a stop which comprises an adjustable screw 36 threaded within an extension 31 attached to the upper portion of the member 33 (see Fig. 6). 'Ilhe dovetailed member 3| has also an adjustable stop which consists of an adjustable screw 38 threaded within the' upper end Bla of the member 3|. A compression spring 39 is placed between the upper portion 3 la of the dovetailed member 3| and an adjustable knob 40. The knob 40 has a threaded extension 4| which is threaded within an end casting 42 that is attached to the upper portion 32a of the dovetailed plate 32. In addition an adjustable screw 43 that has a knob 44 is threaded within an angle-shaped extension 45 of the sliding dovetailed member'33. The adjustable screw 43 is located off center in respect to the center of the swivel point 30 and contacts the upper portion 29a of the base 29. The screw 43 isused to tilt the base uponthe swivel point 30 to the desired angle corresponding to the angle of inclination of the vertical portion of the cutting edge of the teeth of the blade.

Referring to Fig.-5 which illustrates in detail the cam arrangement and the swivel point levers for projecting the grinding disk in a vertical and horizontal plane, the cam 46 isv attached to the cam-operating shaft 41 which is rotated within the bearings 49 and 49 and'is driven by V-belt 5U and a V-pulley 5|, both driven by an electric motor (not shown). A hand wheel 521s also attached upon the shaft 41 to be used for manual operation when it is necessary to set the grinding machine 20 before the tooth tiling operation.

VThe cam 4B contacts a roller 53V which is held upon a stud 54 fastened to the right side end 55 of the pivotally mounted rockerarm 56. The left end 51 of the rocker arm 5B also has a pivoting studv 58 having a roller 59 which contacts the lower portion 3|b of the dovetailed member 3l. The rocker arm 56 is pivotally mounted upon'a stud B that is held within a vertical block 6| (see Fig. The portion 56a`of the said rocker arm 56 that is pivoted upon the stud 30 is fitted 'within a vertical groove Sla that is cut withint'he block 6|.

A cam -62 which is also attached upon the driving shaft 41 contacts a secondaryroller 63 which is heldl upon a stub 64 the latter held within the right end 65 of the pivotably mounted rocker arni 65. The left end 56a. of thel lever 6B has also a stud 61 with a roller 68 mounted therein and in contact with the lower portion 3312er the horizontally movable dovetailed member 33. VThe portion 66a of the rocker arm SB is tted within a vertical groove Bib, cut within the block 6|, and like the rocker arm 5B is pivoted upon'the stud 60.

In Figs. 1, 3; 4, 5, 7 and '8' thereis shown the manner the blade of the-saw is moved automatically afterV a complete grinding operation upon the cutting edge of one ltoothand the inclined face of the adjacent tooth.` The4 mechanism" 69 used in advancing the bladeB vof the band saw' `Sl comprises an upright base member with a dovetailed elongated portion 1|, the latter supd porting a dovetailed bar 12 which moves within the dovetailed groove 13 and is made to slide snugly through a plate 14 and adjustable pressurescrews 15. The dovetailed member 12 has an extension 16 which carries a tubular member 11 supporting an adjustable rod 18. The rod 15 slides within the tubular member 11 and is made fast through a locating screw 19. The left side end of the adjustable rod 18 has a pair of ears 8| which support a flat block 82, the latter held to said ears through the medium of a screw and boltA 83. A guiding member 84 is secured to the portion 85 of the block 82 and ends in a ratchetshaped portion 86. The portion 86 of the guiding member 84 is shaped to nt within the cutting edge Kept the blade B of the band saw; S. Referring to Fig. 5 it can be seen that a compression spring 81 is placed within a hollow portion 88 of the dovetailed member 12 of the blade-advancing device 59 and a L-shaped bracket 89 is attached by means' of a screw 90 to the back 1|a of the dovetailed portion of the member 10. The left side of the spring 81 is fitted within a hollow portion 9| of the L-shaped member 89 and a rod 92 is fitted within the spring 81. The rod 92 has at one end thereof a threaded portion 93 that is threaded within the dovetailed member' 12 while the other end 94 is slidably fitted'within an opening in the L-shaped member 89. The end 94 of the rod 92 carries a pair of nuts which serve as a stop and are also used to adjust the amount of motion of the blade-advancing device 10.' In addition an adjustable knob 95 is thread-V ed upon the right side of the rod 80 and" is used to calibrate the length of the stroke the' bladeadvancing device has to supply to advance the blade one tooth at a time and depending upon the pitch of the teeth of the band saw. The right side end 12a of the dovetailed member 12 has a pair of extending ears 95 which support a roller 91, the latter contacting a cam 98 that is rigidly held upon the driving shaft 41. The roller 91 is rotatably held within the ears 96 through the medium ci a bolt and nut 99. The band saw blade S is supported upon the base plate |00: by means of an upright L-shaped member |0| which: has an adjustable portion |02. portion |02 is located under the bottom of theband saw blade B and has an extension |04' thaty is supported by anA adjustable screw |05, the latter being threaded. within the threaded portion |05 at theV base of the LTShaped member 10|. The upper end |0541. of the adjustable screw |05 is rotatably held within the extension |04 throughthe medium of apair of collars |01, while L-shaped upright has a pair of extending members |08 which serve to support a clamping arm |09 thathas a clamping portion I0 facilitating the clamping of the blade B within the clamping Ydevice |Y0l.. The lower portion of the clamping' member' |09V is hinged within the hinge extensions |08 by means of the pivots and carries an adjustable tight ening screw l l2 which has a tighteningknob H3. The adjusting screw |05 has also a knob I|4that is used for manual adjustment of the sliding plate |03 and the blade adjusting portion 02 respectively.

Referring to Fig. 2 is illustrated three different ways'the cutting edge K of the blade B is ground. It can be seen that in the case of the blade I the e grinding wheel 22 is on a line 90 degrees par allel to the cutting edge K of the tooth T of the The adjustable.-

y is raised or loweredthrough theV medium of a sliding plate |03 which.

ting edge.

blade B, whilein the case of blade-II? it is somewhat inclined towards the rightffalthouglifit is still parallel with the cutting edgeKJf-In the lastcaseof `blade III the:4 grinding diskf 22' isinclined towards the left. It is understood that any Iangle of inclination Vof the disk 22 can be *procured and this is accomplished-"by turninglupon point 30.

Fig.*9-showsa blade B having teeth'T which have `a circular-'or rounded base-C. It 'can be `seen that the grinding'disk22 -inthis 'particular case must have a rounded-cuttingedge R; -Si'rnvilarly in the case of the'blade B" shown -in Fig.

10 the cutting edge K -has acircularr base C -a1 though a trapze-shaped vtooth TRI In this case the grinding disk 22 has also a circular rounded cutting edgeR. l i

' .Olzleation f Referring to Fig. 1 it can be seen that the'blade ithe knob 44 rotating the adjustable-screw that. serves-to tiltthe base plate 29 'uponv the-swivel gil() B of the band saw S is placed within the jaws of the clamping device l0|,'whi1e adjustable knob I|3 is -rotated 'bytheoperator until vthere is -enough pressure applied bythe clampingarm I I0 Lagainst the at side of'theblade leaving "just enough clearance to allow the latter to be moved in the direction indicated by the arrow A. -The blade B remains in place within the jaws of the clampingl devicey 10| for a lengthr-of time allowing the grinding disk 22- tov descend upon the cutting edge K of theA tooth T and then advances along .the inclined face of the adjacent Vtooth until it reaches'the extreme opposite endA that is adjacent to the `cutting edge of said'adjacent tooth. Once this position is reached by the grinding disk, rthe latterV will start descending along the inclined contour of the tooth to reach the cutting edge of` the adjacent tooth from@ `which the grinding' has started.` The grinding threaded'withinthe-L-shaped :member 45 and ycontactsthe upperportion 29a. of the base plate -"29.- Should it be required tochange the horizontal positionof Vthe grinding disk-.22 as shown in Position I of Fig. 2 the knob 44 is turned in a clockwise direction lto tilt thebase `plate 29 downwardlyiagainst the swivel point 30 thus forcing the grinding disk y2f2-tc-be 'placedfin an inclined position as'lshow'n in Position III of Fig.' 2 In case it is requredto tiltthe grinding wheel 22 vto aPosition :IIshown in'Fig. 2theknob 44 is rotated in. a counterclockwise direction to allow the base plate 29 to betilted upwardly.

In Fig. 1 the grinding disk 22 is shown in a neushowndescending upon the cutting edge K of the tooth 'I'. 1 This motion-is accomplished by lowering. Vthe rollerrs'which isr rotatably held upon the stub 61 that is fastened to the left end 66a ofthe swivel arm 61. A secondary-roller v63 is rotatably-heldfupon` al stubr 64 attached tov the right side 65V ofthe swivel arm 66." The swivel f arm 66 swivels upon the stub 66 that is held within the block 6 I.

- A secondary swivel 'arm 56' also swivels upon the s'tub\60."-J-The left* side end 51 of` theo-arm 56has-a= stub 58 'having va' roller 59 Y thelatter contacting thelowerpcrtionv 3Ib of disk 22 will at that point startgoing upward until it completely clears the top of the saidcut- 'During the grinding vancing device 69 remains in an'inoperative p'os1- tion but as soon as the grinding-operation has beencompleted the blade-advancing device'comes into play and advances'theblade Bi of the band x saw shone tooth towards the direction vof the f grinding disk 22. Once the blade has -beenvmoved lthe desired amount the blade-moving device revcedes to its originalstarting position and remains operationA ftheblade-adin place ready to advance the blade anotherftooth operation. A l

In Figs.` 1, 3 and 4 inclusive it rcanbe 'seen that -the roller 68 contacts the lower portion 33h' of the after the grinding disk has completed its grinding' dovetailed member 33. 'Ihe dovetail-shaped plate :32 is directly secured upon the dovetailed -memyber 33 in an inclined position lcorresponding to the angular inclination of the tooth T of the blade :ABW-Alsecondary dovetailed memberi3l` isffltted within the dovetail-shapedmember 32,` and a roller 59 contacts thelower portion l311i' of lthe dovetailed member 3|:A The base plate V2911s attached upon the 'dovetailed 'member' 3 I a' rin vsuch a manner asl to allow for a considerable 'amount of'angular tilting. The tilting ofthe plate 2 9 is accomplished through the'medium' of the pivot point 30 which comprises abolt 30h tte'dlwithin an opening 30C within` thev basefplate 29.` bolt 30h has a threaded portion 30a. which is made tight within dovetailed member 3|. To facilitate-the'tilting of the base plate 29 uponthe'v medium of -a' V-belt 50 and V-pulley 5L The' out- .side circumference of the cams46 and 62 -is shaped f in such: ay `manner as to* allow the swivelling of the swivel arms56-'and 66intimedrelation facilitating the upward and downward motion and the i sliding movement of vthegrin'ding disk 22 along the contour of each of the teeth ofthe band saw. Thecams 46 and 62 -are fastened vupon the shaft 41 insuch a relation'lithat their operation upon the swivel-arms 56 andv 66 will .allow for the grindfing disk 22 first, to descend upon the ycutting edge of the tooth to be'ground, second, to'ascendy along the inclined facenf the adjacent tooth,

' third, to descend backwards along'the said inclined face and,-fourth, to'vascend upwardly parvallel to the said cutting'edge of the tooth until said grinding disk will'completely clear the cutting edge of the tooth. In other words, the grind- Yingdisk 22 hasta dual purpose; first, to grind the cutting edge of a'tooth and the inclinedface of an adjacent tooth'and secondly, to have thesur- 'The ` fitted within'the ears 96 is in. contact cams 46 and 62 respectively. rotation ofthe driving shaft41 vwill rotate all three cams 46, 62` and '98 at oncel although 'due Ato theirv position upon the'shaft`41 they will beface vof the said Vinclined face and said cutting edge in its backward stroke whenA returning to its originalstarting position. After the tooth has `been ground as abovethefblade-moving device 10 -comes into play'and it can be seen from'Figs. `1,

3, 4 and 5 respectivelyy that the roller 91 that is with a cam 98. The outside circumference of the rcarri 98 is lshaped in vsuch a manner as yto become elective y only during a portion ofits complete revolution.

It can be also seen `that thecam 98 isattached upon'the driving shaft41 which also supports the In other words, the

'pivotpoint301afknob44 is rotatably' held upon l an! -L-shapedlfmember 45 v.that is `rigidly secured "tothe-dovetailed member 33. The knob 44 has am extending threaded portion 43v which is .rotation of the cam 98 `will allow the roller.. 91

and member l.2.to. recede against the pressureeof the compression spring 81 thus forcing-the bladeguiding gurey G4 to .be moved lone tooth Abackwards to engagcwithinthe cutting edge or the next. neighboring tooth to beground. A.

It can be seen from the above description that theA purpose of, the band saw grinding, machine consists in holding the blade ofthe saw in a desired position within the machine, as to allow a grinding disk to be lowered against and parallel .with `the cutting edge of a. tooth and further to -acilitatethe sliding movement of said grinding i disk along the incline-d face of the adjacent tooth,

then once this` operation is ended the disk will return toits original starting position and be moved away from said `blade and its contact with the cutting edge of the tooth. After the grind- .ing operation has been completed the blade-moving device comes into play and advances the blade of the saw one tooth lat a time in :the direction ofv then grinding disk. The blade B is moved against the pressure ofitsfrictional 'contact with .the clamping device and will remain in position ready for the next grinding operation during which time the bladeeadvancing :device will recede to its original starting position. The tooth grinding and advancing operations continuously Vsucceed each other until al1 the teeth upon the whole circumference of the band saw are ground. Then the saw is removed .by the operator and a new saw is placed withinthe clamping jaws. It

can be also seen that to. operate the present ,de-

vice two motors are required, one to operate the grinding wheel-fand another to rotate the cam shaft `for timing the grinding wheel and the blade-advancing dev-loef It is understood -that one single motor could be used to operate both grinding-and blade advancing mechanisms necessitating the use Vof afgear box or such like .device attached to the motoror providing two separate speeds; one for the grinding Wheel, Aand `another for the .cam shaft.

The vforegoing detailed description Aor the band saw sharpeningmachine has been given for clear- -ness of understanding only and no unnecessary limitations should be `i-inderstood thereirom,gbut

it vshould be .construed as rbroadly vas permissible in vie-w of the prior art.

While the band sawsharpening machine herein illustrated and described `ifs confined .to certain structural details, I do not wish to limit myself to such details, but desiretoicover all forms and arrangements,A being only limi-ted' by the scope `of"v the appending claims By modifying the holding vise Aor vsupport indicated 'by numerals lilll i4 and making motor V2l carrying the grinding wheel `22 swivelable Ain .acreage vcome.eiectivein.different portions duringa complete revolution 1ct the shaft 41. The cam $8 is metal :saws may sharpened .as the under discussion,... What 1 claim isz.

A device of the character described compris- .o irame, Vclamping means on said .frame 'adapted to vhave movably mounted therein a toothed .saw body, avertically disposedsupport on l; said framaavertically reciprocable turret mounted on said support, an angularly s lidable member mounted on said turret, a motor driven cutterdisk mounted on said angularly slidable member, means timed to successively move said turret and singularly slidable member for each band saws .cycle of operation whereby the cutter disk successively .is loweredv to cut the cutting edge of a tooth, shifted, diagonally to grind the .inclined f ace `oaf the .adjacent tooth, returned for descent along said inclined face and for ascent along and above the said cutting edge, and feeder means for the saw body in the clamping means to advance the saw body by intermittent motion one ,tooth at ,a time for each .cycle of operation by the cut-ter disk.

2. A 'device of the character described comprising a frame, clamping means .on said frame adapted to have .movably mounted therein a toothed saw body, a vertically disposed support on said frame, a vertically reciprocable member mounted-on said support, an singularly slidable member .mounted` on said reciprocable member, a motor 'driven cutter disk mounted for pivotal adjustment -on said angularly slidable member, means timed to successively move said vertically reciprocable member and angularly slidable member for each cycle of operation whereby the cutter :disk is lowered ,to cut the cutting -edgeof "a tooth, shifted .diagonally to grind the inclined foce of the adjacent tooth, returned for `descent along saidyinclined face .and ,for .ascent along .and above the .said cutting edge, feeder means for the saw lbody inthe clamping means .to advance the Isavvfbody by intermittent motion one ,tooth .at a time for eac-h cycle of operationby the cutter disk, and adjusting means engageable :with the reciprocable and :slidable A:members to .control outermost positions thereof in accordance with theA .dimensions of thefcuttingfedgeand inclined face of adjacent teeth. l

3.. a .deviceef the character described, a motor drivencutter disk .assembly comprisinga vertically. disposed support,` a lvertically reciprocal turret rmounted .on `said support, an angularly .-slidable member mounted on said turret,.a .motor driven cutter disk. mounted lon 'said lsingularly slidable member, and means timed to ysuccessively move said turret and angularly slidable .member whereby the Icutter disk operates successively in .several planes. v

YL In a device fof fthe character described a motor driven ycutter fdisk comprising a vertically disposed support, a vertically reciprocal turret mounted on .said support, an angularly slidable y member mounted on said turret, amotor Idriven cutter disk mounted for pivotal adjustment .on ksaid .angularly slidable member, means timed to .able memberltpicontrol'outermost positions therethe horizontal .as well .as in `the vertical plane, and

.advancing .the teeth. twoat .a vtime in ,caseswhere cross-.cut types of saws areo'perated upon to permit alternation in .grinding the oppositely Aintesi?" @meer reed and..

, severalsuccessive ,planes .and adjusting means v.engageable with theturret Vand .theangula-rly slidof in accordance with the .dimensionsbf the .cut-

" ting edge and inclinedfafee of adjacent teeth on which the disk fisoperable;

-; geve. 

